Classic ASP long wait

I need the keywords for the HTTP request technique where for one client request the ASP http server keeps the session open until required event occurred and sends then the response and closes the request.
This technique I want to use to minimize poll traffic waiting for new messages and getting the event messages as soon as the event occurs.

I have already read about this technique on the web but now I cannot find it because I do not have the correct keywords for my Google search.

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I dont event need to stream back to client; I need only a regular Response after some long wait for let say 120 minutes. My only desire is to extend the client side request timeout and the IIS ASP page timeout.

I think the best would be to open a new question for both sub questions and post here the reference to those new questions.

By the way, it is exciting how fast the Google indexed EE and this question and I was looped back to my own question by last searches :)

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